JPS5972892A - Remote control circuit - Google Patents

Abstract

PURPOSE:To alarm quicly a faulty area to a service operator by providing a circuit at a remote control part to detect and display a fault of connection of a signal transmission line. CONSTITUTION:When a clock signal or a data signal or a strobe signal is nor receoved through a signal transmission line 8 owing to the connection fault of the line 8, no signal is delivered from the output of a receiving circuit 19-a. The output of a converting circuit 19-c is set at an L level, and therefore a starting circuit 19-a is kept at an L level for a fixed period of time. As a result, the receiving circuit 19-a is not actuated. Thus the output part of the circuit 19-a is set under a high impedance state, and resistances 14-17 are connected to the input terminal of a display device driver 13. Then a driving current is supplied from a power supply, and a display device 10 displays the fault of the connection of the line 8. If a power supply line 18-e or an earth line 8-f has a fault of connection, a backup power supply 18 is actuated.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a remote control circuit for remotely controlling equipment bodies, and is intended to be applied to remote control of household boilers, water heaters, etc. It is something.

Conventional configuration and its problems A conventional example will be explained with reference to FIG.

In the main body, 1 is the main body of the water heater, and 2 is its heat source.

3 is a heat source control means, which is an electromagnetic valve or an electromagnetic pump constituting a heat source that provides thermal energy to water; 4 is a drive circuit thereof, which is composed of a transistor, a thyristor, etc. 5 is the main control means, which is usually used in a microcomputer. 6 is a hot water temperature detection element that detects the hot water temperature. 7 is a power supply circuit that supplies power to the main body side and the remote control unit. 8 is the signal transmission line 8-I
L transmits a signal from the remote control unit to the main control means. B
-b, s-c, and 8-d send signals from the main control means, and 8-el and 8-f are power and ground lines.

In the remote control section B, numeral 9 denotes a receiving circuit for receiving transmission signals from the main control means, and is usually composed of a microcomputer, a shift register circuit, etc.

10 is a display word that indicates the operating status of the water heater. 1
1 is a switch, a hot water temperature setting volume, etc., and 12 is a transmitting circuit that sends a signal to the main control means, and a microcomputer, an analog switch, etc. are used.

Next, the operation will be explained.

A case where the receiving circuit 9 and the transmitting circuit 12 in the remote control unit B use a shift register and an analog switch will be described with reference to FIG. 2.

A clock signal and a data signal are sent from the main control means 5 to the receiving circuit 9 of the remote control section B. The clock signal 2' is a synchronizing signal when serially transmitting data signals, and the data signal ports are display signals and channel signals of the transmitting circuit 12, respectively. After transmitting the series of data signals B, a strobe signal 11 is transmitted from the main control means 5, latched and outputted from the output side of the receiving circuit 9 for the first time. When the display signal is transferred as data, the display 1o lights up and the channel signal is sent to the transmission circuit 12, which sequentially selects the signal channels of the keys and hot water temperature setting volume and transmits it to the main control means 5 in a time-division manner. . In the main control means 6, the heat source control means 3 is activated by a signal from the remote control section B.

When the heat source section 3 is movable and some abnormality occurs during operation, the operation is immediately stopped F and a display signal indicating the abnormal state is transmitted to and displayed on the display 1o. If the display 10 is a numeric display or the like, it will be easier for users and service personnel to specifically specify the location of the failure.

However, the water heater 1 is installed outdoors, and the remote control unit B is installed in a place away from the water heater 4, such as in the kitchen.

The signal transmission line 8 is wired, and when it is installed, it is stopped by biting the insulating vinyl, or due to changes in environmental conditions, the installation part corrodes.

Sand, soil, etc. accumulate on the fixed portion of the signal transmission line, causing poor contact, or the signal transmission line 8 is often cut due to external force, causing poor connection. The main control means cannot take any measures against these, and the user is not aware of them.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned problems and provide an easy-to-use remote control circuit with a simple configuration and at low cost.

A signal transmission line connecting a component device of the invention and a remote control unit, an abnormality detection circuit provided in the remote control unit that detects a connection failure of the signal transmission line, and an abnormality display that displays a connection failure of the signal transmission line. It has a backup power source that allows the display to be displayed correctly even if there is a connection failure in the power line or ground line among the signal transmission lines.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, the same numbers as in FIG. 1 are components having the same functions. Reference numeral 13 denotes a display driver, which has a decoding function for displays 'f and g1o.

Further, a signal current is supplied to the display tJ6 base driver 13 through resistors 14, 15, 16, and 17.

Reference numeral 18 is a backup power source, 18-a is a battery, etc., and 19-b is a diode, etc., which prevents current from flowing in from the normal power source. Reference numeral 19 denotes an abnormality detection circuit having functions of receiving signals from the main control means 5 and detecting failures.

FIG. 4 shows an example of this.

19-iaij A signal receiving circuit consisting of a microcomputer, a shift register, a latch circuit, etc. FIG. 4 shows an example of a shift register and a latch circuit. 19
-b is a starting circuit for the receiving circuit 19-a, which has a time element and gradually becomes low level.
a will no longer work.

19-C is a conversion circuit that converts the output signal of the receiving circuit 19-a into a DC level. Resistance 20, 21.

22, 23, 24, 25, and 26.27 supply signal currents for the display 10.

When the signal received from the signal transmission line 8 is output from its output, it is input to the conversion circuit 19-C.

Conversion circuit 19-C until the signal of starting circuit 19-b goes down.
A signal is output from the output of the receiving circuit 19-a, and the receiving circuit 19-a maintains its operating state. Now, if the clock signal, data signal, or strobe signal cannot be received from the signal transmission line 8 due to a signal line connection failure, the receiving circuit 19-a
No signal is output from the output of the conversion circuit 19-c, and the output of the conversion circuit 19-c is at the "low 11 level. Therefore, the starting circuit 19-c
After a certain period of time, a becomes low level, and the receiving circuit 1
9-a will no longer work. That is, the output section of the receiving circuit 19-a becomes in a high impedance state. A resistor 14゜15.16.17 is connected to the input terminal of the display 2g driver 13 so that drive current can be supplied from the power supply, and the display 10
indicates a connection failure of the signal transmission line 8.

In addition, if the power line 8-e or the ground line 8-f has a poor connection, the backup power source 18 is activated to supply power to the entire remote control unit B and maintain the display.

With such a configuration, even in the normal state, the display path 1o can also be used for displaying in the case of abnormal connection or poor connection.

According to the remote control circuit of the present invention, the device side and the remote control unit are connected by a signal transmission line as described in 2.
It consists of an abnormality detection circuit for a signal connection failure provided in the remote control unit, and an indicator that displays an abnormality indication of a connection failure based on the signal from the abnormality detection circuit. Immediately display +J second, and the user
In addition, it was possible to quickly alert service personnel to the location of the failure, resulting in a highly practical effect.

[Brief explanation of drawings]

FIG. 1 is a conventional remote control circuit diagram, FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a remote control circuit of the present invention, and FIG. 4 is an abnormality detection circuit diagram of the same circuit. 5...Main control means, 8...Signal transmission line, 1o...Display device, 18...Backup power supply, 19...Abnormality detection circuit. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (3)

[Claims] (1) A main control means that controls the entire device;
It consists of a remote control unit that remotely controls all of the equipment, and a signal transmission line that connects the equipment and the remote control unit. A remote control circuit equipped with an indicator that indicates a connection failure of the signal transmission line using the output signal of the output circuit. (2) The remote control circuit according to claim 1, wherein the remote control unit has a backup power source for an abnormality detection circuit and an abnormality indicator. (3) The remote control circuit according to claim 1, wherein the abnormality display word also serves as a status indicator that displays the status of the machine 2g.